/**
 * 
 * Copyright 2009, 2010 Mike Jamer [email: mikejamer@gmail.com ]
 * 
 * This File is part of Moose IRC
 * 
 * MooseIRC is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * MooseIRC is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with MooseIRC.  If not, see <http://www.gnu.org/licenses/>.
 * 
 */

using System;
using System.Net;
using System.Net.Sockets;
using moose.extension;
using moose.irc;

namespace moose.actions
{
	/// <summary>
	/// Command enables Session to connect to IRC Server
	/// </summary>
	[CLSCompliant(true)]
	[Action(Type = ActionTypes.Command, Name = "moose-std-cmd-connect", Description = "Connects Session to IRC Server", Version = "0.1", Author = "Mike MacKenzie-Jamer<email:mikejamer@gmail.com")]
	[Trigger(TriggerText = "SERVER")]
	public sealed class ConnectCommand : IrcAction
	{

		/// <summary>
		/// Returns States, Valid for this command to execute 
		/// </summary>
		/// <returns>
		/// A <see cref="IrcSessionStates"/>
		/// </returns>
		public override IrcSessionStates valid_states ()
		{
			return IrcSessionStates.Disconnected | IrcSessionStates.None;
		}

		/// <summary>
		/// Connect to IRC Server 
		/// </summary>
		public override void action (IrcSession session, IrcMessage message)
		{
			if (!validate_input(session, message)) return;
            connect(session, message); return;
		}

		/// <summary>
		/// Validates the input for this command 
		/// </summary>
		/// <param name="message">
		/// A <see cref="IrcMessage"/>
		/// </param>
		/// <returns>
		/// A <see cref="System.Boolean"/>
		/// </returns>
		private bool validate_input (IrcSession session, IrcMessage message)
		{
			bool valid = true;
			int port;
			if (message.Arguments.Length != 2) {
				session.notify_event (IrcEvent.createEchoEvent ("-:Connect:- Must Provide two arguments, host [and] port"));
				valid = false;
			} else { //Must have two arguments for these validations to properly fire...
				if (!int.TryParse (message.Arguments[1], out port)) {
					session.notify_event (IrcEvent.createEchoEvent ("-:Connect:- Port must be numeric"));
					valid = false;
				}
				if (port < 1 || port > 65535) {
					session.notify_event (IrcEvent.createEchoEvent ("-:Connect:- port must be between 1 and 65535"));
					valid = false;
				}
			}
			
			return valid;
		}

		/// <summary>
		/// Attempt to resolve the host string
		/// </summary>
		/// <param name="host">
		/// A <see cref="System.String"/>
		/// </param>
		/// <returns>
		/// A <see cref="EndPoint"/>
		/// </returns>
		private IPHostEntry resolve (string host)
		{
			return Dns.GetHostEntry (host);
		}

        /// <summary>
        /// Connect to IRC Server
        /// </summary>
        private void connect(IrcSession session, IrcMessage message)
        {

            //TODO: Very Basic Connect Setup, barely works, barely any thought put into it.

            session.notify_event(IrcEvent.createEchoEvent("-:Connect:- Connecting to " + message.Arguments[0] + " : " + message.Arguments[1]));
            IPHostEntry entry = resolve(message.Arguments[0]);
            int port = int.Parse(message.Arguments[1]); //We've already validated that this will parse, so this should be safe
            IPEndPoint remote_endpoint;
            foreach (IPAddress address in entry.AddressList)
            {
                session.notify_event(IrcEvent.createEchoEvent("-:Connect:- Connecting To: " + address.ToString()));
                remote_endpoint = new IPEndPoint(address, port);
                session.Connection.connect(remote_endpoint);

                if (session.Connection.Connected)
                    break;
            }

            if (session.Connection.Connected)
            {
                session.SessionState = IrcSessionStates.Connected;
                session.notify_event(IrcEvent.createEchoEvent("-:Connect:- Connected to: " + message.Arguments[0]));
                session.notify_event(new IrcEvent(IrcEventTypes.ServerConnected));
            }
            else
            {
                session.SessionState = IrcSessionStates.Disconnected;
                session.notify_event(IrcEvent.createEchoEvent("-:Connect:- Failed to Connected to: " + message.Arguments[0]));
                session.notify_event(new IrcEvent(IrcEventTypes.ServerDisconnected));
                //TODO: determine if there are any more servers in the group, or whaveter...
            }

            return;
        }

	}
}
